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(No Model.) 2 Sheets-Sheet 1. E. R. HYDE & E. VALLENTINE.

KNIFE GRINDING MACHINE.

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w o m B m A (No Model.) 2 Sheets-Sheet :2. E. R. HYDE & E. VALLENTINE.

KNIFE GRINDING MAGHINE. No. 310,861. Patented Jan. 13, 1885.

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ELVVIN It. HYDE, OF SPRINGFIELD, AND EDWARD VALIJENTINE, OF FLOR- ENCE, MASSACHUSETTS; SAID VALLENTINE ASSIG-NOR TO SAID HYDE.

KNIFE-GRINDING lVlAGl-HNE.

SPECIFICATION forming part of Letters Patent No. 310,861, dated January 13, 1885.

Application filed January 15, 1884. (No model.)

To all whom it may concern.-

Be it known that we, ELWIN R. HYDE and EDWARD VALLENTINE, citizens of the United States, residing, respectively, at Springfield, in the county of Hampden and State of Massachusetts, and Florence, county of Hampshire, and State aforesaid, have invented new and useful Improvements in KnifeGrinding Machines, of which the following is a specification.

This invention relates to improvements in knife-grinding machines, the object being to improve the manner of hanging the shaft carrying the worm-feed which moves the carriage, whereby the action of the driving-belts is made more effective; to improve the devices for engaging and disengaging the feed-worm and worm-gear; to improve the relative arrangement of said worm-feed shaft and its drivingshaft; to improve the connections of theknifebar-feeding devices,whereby both ends of the knife bar are made to move equally and whereby the knife-bar can\be set at an incline to the face of the wheel for grinding tapering; to improve the means of feeding the wheel to the work; to improve the means for pr eventing the water-drip from spreading unrestrictedly over the machine; to provide improved knife-clamping devices on the knife bars and duplicate knife-clamps on the samebed,wl1ereby while one ormore knives are being ground others may be set ready to be ground when the first are finished, and to provide improved feed bar latches on the bar governing the crossfeed.

In the drawings forming part of this speciii cation, Figure l is a front elevation of a knifegrinding machine embodying our improvements. Fig. 2 is a rear perspective view. Figs. 3 to 8, inclusive, are detail views.

This invention is in the nature of an improvement on the patent to Orrin Bryant,

. dated October 3, 1882, to which reference may be had; but it embodies certain features of construction not shown in said patent relating to the employment of a grindingwheel of different form from that there shown.

In the drawings,Ais the bed of the machine, having thereon a sliding carriage, B, having on it a rack, 3 3. The carriage B is given a movement on the bed A back and forth by means of the devices shown in Fig. 5 of said patent, the worm 0 on the shaft n of this application engaging with a worn1-gear, as in said Fig. 5, and causing a pinion to rotate in both directions in engagement with the rack 38, said rack being shown in Figs. 1 and 2.

As heretofore constructed the worm-shaft n had its swivel-bearing n between the pulleys thereon and the worm end of the shaft, and as a consequence of the location, as stated, of said bearing, the downward movement of the worm '1) to unship it from the worm gear tightened the driving-belts by throwing the pulleys upward, and when the worm was moved up to ship it and run the carriage the belts were less tight than when doing no work. That objection is remedied in this machine by extending an arm, a, beyond the end of the bed A, and hanging the swivel-box n" near its end, so as to bring the bearing near the end of shaft in and permit of placing the driving-pulleys thereon between the bearing and the movable end of the shaft. By so doing, when the worm '0 is dropped away from the worm-gear to stop the carriage, the belts are slacked, and when the worm is working in its gear they are tightened, as they should be. The hood or casing t, which covers the said wormgear, is substantially like that in said patent, as also are the shipper-lever r, connected to the rod m, and the spring stop bolt s,- but the improved means for operating the worm end of the shaft to ship and unship it consist of a lever, 5, having thereon a cam, 23. As seen in Fig. 5, a screwed stud, 22, which is flXGCl on the box of shaft n, behind the hood t, projects through an opening in the latter, in which cam 23 rotates, turned by lever 5, when the latter is secured on said stud by the nut 6, and thereby the end of shaft 12 is moved up and down. The nut 6 serves to tighten and release the lever 5.

To equalize the draw of the belts in this machine on the intermediate shaft, b, the shaft is hung in a box on one of the legs of the ma chine, one end proj ecting beyond the latter and carrying the pulleys from which the belts run to those 011 shaft n, and shaftb is driven by a belt from shaft i running onto the pulley 0. By this arrangement the shaft-box is located between the pulleys thereon, and the strain of the belts is equal at each end of the box. In said patent there are no means for nicely adjusting the incline of the knife-bar and the knives it holds relative to the wheel; but the bar is swung in its bearings by hand, and then secured by the end screw. stantially the same end case for the knife-bar is provided; but the bolt 36, Fig. 3, passes through the case, and the nut 10 screws on its end to draw the flange 35 on the knife-bar D tightly against the end of the casing 9, which is chambered to receive the beveled edge of said flange, as clearly shown in Fig. 3, said flange being adapted to turn on the latter. A worm-gear, 34, is secured on the bolt 36 by means of the set-screw in the hub of said worm-gear in case 9, and a worm,-33, adapted to be turned by handle 8, is hung on case 9 and engages with gear 34. By turning worm 33 the knife-bar and knife are nicely adjusted, and when nut 10 is unscrewed the bar and knives will not roll over against the bed or carriage, but will remain in proper position. The outer end of the knife-bar only is provided with said casing and worm and gear. The inner end is supported in a bearing, 11, which swivels in the cross-feed block 31, for a purpose hereinafter set forth. No swivelbearing is provided at the outer end, as the motion there is so small as to render a bearing unnecessary. The beveled edge of flange 35 accommodates itself to a certain amount of variation, and will still clamp the knifebar D when nut 10 is screwed up. The crossfeed blocks 31 are arranged and adapted to operate and carry the knife-bar D sub stantially as shown in said patent; but the devices operating the feed-screws 37 are improved as follows: The feed-screw gears 2, I

which are operated by the pawl 7, have teeth on their peripheries, with which said pawl engages to turn them in either direction, and all of said gears are adapted to engage with beveled pinions3 and 4 on a connecting-shaft, h. The said pinion 4 is fixed on the shaft h,- but pinion 3 is, by athumb-serew, capable of being disengaged and moved away from the gear 2, so that when shaft h is turned only one of gears 2 is operated. By-this means, and because the bearing 11 on block 31 may turn therein, the knife or other article being ground may be set with one end nearer the wheel than the other to grind to a taper, and,when so set, gear 3 be brought into engagement again with the cross-feed gear. Furthermore, connecting the two feed-gears of each knife-bar insures the uniform rotation of both, and consequently a perfect line-feed of the knife. The shipper-bar o is connected to the pawl-post 35, and the latter operates to hold the pawl 7 by the block 36, substantially in the manner shown in said patent. The pawl 7, however, being an oscillating one, either end of which may be engaged with the wheel 2, the machine is adapted for either In the machine herein shown subright or left hand tapers. The bar of is provided with improved adjustable latch-blocks to engage with the end of lever r, whereby the motion of the carriage is reversed by shipping the driving-belts. Fig. 7 illustrates said latch-block, which is, by a hand-screw, tightened or loosened on the bar 12 and is provided witha pivoted latch, 10 which may be swung up, if desired, to prevent lever r from being operated by it when the work on one of the knife-bars has been ground and it is desired to carry the other knife-bar into position for grinding the work on it. The blocks 31 are provided with, an adjusting stop-screw,x, as

shown in Fig. 8, which, by abutting against the front support to screw 37, prevents the knife-bar from being drawn back too far, and thereby binding the worm-gear 34 against the Worm 33.

The grinding-wheel e in this machine is of the description called a tub-wheel, and is secured on the end of a shaft, (1 which is set at right angles to the bed A, running in bearings on a carriage, 25, on a bed, 27,which carriage is movable on the latter by a screw, 26, whereby the face of the wheel is adjusted to the knives 13 as it wears away. The wheel is driven by a belt running on pulley d. A hood, 24, covers the wheel, to prevent water from being thrown off. The water is supplied to the wheel from the tank 19 through the pipe 20 and the perforated pipe 21.

Wheels of the class herein shown do not concave the edge of the knife while grinding it, and require to be moved to and from the latter in a right line.

To keep the water which escapes from the wheel while grinding from inconveniently running over the carriage and bed of the machine, a drip-pan, 28, is placed on the carriage, cast thereon integral therewith, below the edge of the knife-bar. A drip-pipe, 29, leads from pan 28, and conducts water from the latter to a drip-pan, 30, which is cast on the rear side of the bed A, and is long enough to provide for having the end of the drip-pipe 29 over it, whatever may be the position of either knife-bar on carriage B. A pipe is carried from the pan 30 at any convenient point, to conduct the water therefrom into a pail or onto the ground.

The machine shown in said patent provided for only one knife-bar and operating devices; but in this machine two knife-bars and two sets of operating devices are provided, so that while the wheel is grinding the knives on one bar knives are being adjusted to the other one, and much time is saved thereby. Both sets of feeding devices are operated by a single shipper-bar, o

Improved clamping mechanism is provided in this machine for securing the knives 13 onto-the bars D; and it consists of a clamp-plate, 113, secured to bolts 14, passing through bar D, and in the heads of said bolts are pivoted the clamp-levers 16, whose short arms bear on the heads of the adjustable screws 15, and

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whose long arms bear on the surface of a cam, 18. By turning the latter the plate 113 is operated to clamp or to free the knives 13. A spring, 17, has one end engaging with the bolt 14, to move the plate 113 away from the bar D when the levers 16 are freed. The yoke 12 is .pivoted at the ends of bar D, and is swung down, as in Fig. 2, to adjust the knives in proper position on the latter. The blocks 31 are provided with graduatingmarks on the side, whereby,by the aid of a mark on the way 32 below, the knife-bar may be adjusted to a certain line of work when it is desired to grind several knives uniformly.

WVhat we claim as our invention is 1. In a knife-grinding machine, the bed A, having the arm a thereon, the swivel-bearing n hung in said arm, and the feed-shaft n, having one end supported in said bearing, and the belt-pulleys thereon located between the bearing a and the worm'bearing end of the shaft, combined and operating substantially asset forth.

2. The combination, with the bearing of the shaft a, back of the hood 2%, of the latter having a cam-socket therein, the screw-stud 22, the cam-lever 5, and the nut 6, substantially as set forth.

3'. The combination of the knife-bar D, having flange 35, the casing 9, adapted to receive said flange, the worm 33, worm-gear 34, and the hand-nut 10, substantially as described and shown.

4. The combination of the, block 31, knifebar D, screw 37, the gear 2, having teeth on its periphery, and the oscillating pawl 7, adapted to set said gear for either right or left hand tapers, substantially as described and shown.

5. The carriage B, having the pan 28 cast integral therewith under the knife-bar, and having tube 29 therein, and the bed A, having the pan 30 cast thereon and located under the end of tube 29, combined and operating substantially as set forth.

6. The combination, with the knife-bar D and with the clamp-plate 113, of the bolts 14. screws 15, levers l6, cam 18, and springs 17, substantially as set forth.

7. The combination of the knife-bars D, shaft 1), adjustable blocks to, having pivoted latches w thereon, and the lever -r, substantially as set forth.

ELW'IN R. HYDE. EDW'ARD VALLENTINE. Witnesses:

WM. H. CHAPIN, J. D. GARFIELD. 

